Took a few rounds back and forth to show the CM mileage statement with my name and account number (zoom out and screenshot!). They wanted activities for the last 2 months. I hadn't actually flown with *A in the last 2 months, but between starting the challenge and the discussions I took a UA leg credited to CM, which I was able to show, the previous activity was in September. Seemed to do the trick! (I don't know if an upcoming long-haul booking in J with Turkish helped swing the deal....). I was hoping for Elite Plus to be honest, but won't complain! Now to convert my TK elite to Flying Blue Gold... Will report back!